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The protagonist. A researcher who managed to create an aphrodisiac while experimenting on hormone secretion. He often gets called to teach at the school his step daughters attend. After an accident where he was exposed to certain chemicals he became sexually impotent for a while, but regains it aft... read more

The protagonist. A researcher who managed to create an aphrodisiac while experimenting on hormone secretion. He often gets called to teach at the school his step daughters attend. After an accident where he was exposed to certain chemicals he became sexually impotent for a while, but regains it after seeing Airi and Marina. Soon after this he realized that he only gets aroused by younger girls, and he decides to marry Airi and Marina's mother in order to get closer to them.

♀ f

A first-year student at Seifu Academy. The younger sister. A virgin. Her grades are average, and she’s active in the light music club. She’s half-French, with strong French heritage, and her breasts are on the larger side. She’s free-spirited and willful, and she’s terrible at household chores. She ... read more

A first-year student at Seifu Academy. The younger sister. A virgin. Her grades are average, and she’s active in the light music club. She’s half-French, with strong French heritage, and her breasts are on the larger side. She’s free-spirited and willful, and she’s terrible at household chores. She respects her older sister, but when they’re face to face, she’s nothing but sarcastic. She finds the protagonist suspicious.

♀ f

A third-year student at Seifu Academy. The older sister. A virgin. She’s a studious, reserved, and serious girl. She’s half-French with strong Japanese heritage, but she has quite large breasts. She helps her mother with household chores. She’s been dating her boyfriend for a year, but it seems they... read more

A third-year student at Seifu Academy. The older sister. A virgin. She’s a studious, reserved, and serious girl. She’s half-French with strong Japanese heritage, but she has quite large breasts. She helps her mother with household chores. She’s been dating her boyfriend for a year, but it seems they haven’t had sex yet. However, they’ve apparently promised to have sex after her midterms, and because of her serious nature, she’s feeling conflicted. She wants to support her mother and father.

♀ f

Airi and Marina's mother, recently remarried to Kouzou.

♀ f

A first-year student at Seifu Academy. Airi’s best friend. A virgin. Her grades are average, but she’s terrible at sports. She met Airi back in elementary school, when Airi was an outcast, and they’ve been friends ever since. She seems to envy the fact that Airi’s new father is a university professo... read more

A first-year student at Seifu Academy. Airi’s best friend. A virgin. Her grades are average, but she’s terrible at sports. She met Airi back in elementary school, when Airi was an outcast, and they’ve been friends ever since. She seems to envy the fact that Airi’s new father is a university professor. She’s a member of the video club and wants to shoot a music video starring Airi. She has an average bust size.

♀ f

A third-year student at Seifu Academy. She’s in the same class as Marina. She is not a virgin. In exchange for medical treatment for her parents, she serves as a test subject for the protagonist’s research; she shows no signs of reluctance and calmly accepts his requests. Because she places absolute... read more

A third-year student at Seifu Academy. She’s in the same class as Marina. She is not a virgin. In exchange for medical treatment for her parents, she serves as a test subject for the protagonist’s research; she shows no signs of reluctance and calmly accepts his requests. Because she places absolute trust in the protagonist, she is inwardly unsettled by the arrival of Marina and Airi. The protagonist took her virginity, and she has no experience with sexual intercourse with anyone other than him. By the way, she has small breasts.

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Marina's boyfriend. When Kouzou finds out Marina plans to give him her virginity, Kouzou uses the aphrodisiac to claim her for himself, and to further split them up, arranges for Marina to catch Masato being unfaithful, in the act.

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Kouzou's fellow researcher who helps him develop the aphrodisiac spray with Yuka being a willing test subject.